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Piston to Cylinder Clearance.

Next in line in the "Low Budget" cylinder repair articles, is measuring the piston to cylinder bore clearance. There are few tools out there but keeping the budget in mind, not all of them will suit our purposes. Hence, a quick and easy way is to use piston fit fillers, something everyone should have in his toolbox. Piston fit fillers are cheap and very useful. You will need 0.002, 0.0025 & 0.003 inch fillers as these will cover most of your needs.

You will have to measure the clearance on a 90 degree position in relation to the piston pin. Along the "boost" port is what I usually prefer. A 0.002 inch clearance is suggested for most engines (0.05mm) but consider going up to 0.003 inch (almost 0.08mm) as this will most probably save the race!